StrokeIntersection.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / MS / Internal / Ink / StrokeIntersection.cs / 1305600 / StrokeIntersection.cs
                        
                        
                            //------------------------------------------------------------------------ 
// 
// Copyright (c) Microsoft Corporation. All rights reserved.
// 
//----------------------------------------------------------------------- 
using MS.Internal;
using MS.Internal.Ink; 
using MS.Utility; 
using System;
using System.Windows; 
using System.Collections.Generic;
using System.Globalization;

namespace System.Windows.Ink 
{
    ///  
    /// A helper struct that represents a fragment of a stroke spine. 
    /// 
    internal struct StrokeIntersection 
    {

        #region Private statics
        private static StrokeIntersection s_empty = new StrokeIntersection(AfterLast, AfterLast, BeforeFirst, BeforeFirst); 
        private static StrokeIntersection s_full = new StrokeIntersection(BeforeFirst, BeforeFirst, AfterLast, AfterLast);
        #endregion 
 
        #region Public API
 
        /// 
        /// BeforeFirst
        /// 
        ///  
        internal static double BeforeFirst { get { return StrokeFIndices.BeforeFirst; } }
 
        ///  
        /// AfterLast
        ///  
        /// 
        internal static double AfterLast { get { return StrokeFIndices.AfterLast; } }

        ///  
        /// Constructor
        ///  
        ///  
        /// 
        ///  
        /// 
        internal StrokeIntersection(double hitBegin, double inBegin, double inEnd, double hitEnd)
        {
            //ISSUE-2004/12/06-XiaoTu: should we validate the input? 
            _hitSegment = new StrokeFIndices(hitBegin, hitEnd);
            _inSegment = new StrokeFIndices(inBegin, inEnd); 
        } 

        ///  
        /// hitBeginFIndex
        /// 
        /// 
        internal double HitBegin 
        {
            set { _hitSegment.BeginFIndex = value; } 
        } 

        ///  
        /// hitEndFIndex
        /// 
        /// 
        internal double HitEnd 
        {
            get { return _hitSegment.EndFIndex; } 
            set { _hitSegment.EndFIndex = value; } 
        }
 

        /// 
        /// InBegin
        ///  
        /// 
        internal double InBegin 
        { 
            get { return _inSegment.BeginFIndex; }
            set { _inSegment.BeginFIndex = value; } 
        }

        /// 
        /// InEnd 
        /// 
        ///  
        internal double InEnd 
        {
            get { return _inSegment.EndFIndex; } 
            set { _inSegment.EndFIndex = value; }
        }

        ///  
        /// ToString
        ///  
        public override string ToString() 
        {
            return "{"  + StrokeFIndices.GetStringRepresentation(_hitSegment.BeginFIndex) + "," 
                        + StrokeFIndices.GetStringRepresentation(_inSegment.BeginFIndex)  + ","
                        + StrokeFIndices.GetStringRepresentation(_inSegment.EndFIndex)    + ","
                        + StrokeFIndices.GetStringRepresentation(_hitSegment.EndFIndex)   + "}";
        } 

 
        ///  
        /// Equals
        ///  
        /// 
        /// 
        public override bool Equals(Object obj)
        { 
            // Check for null and compare run-time types
            if (obj == null || GetType() != obj.GetType()) 
                return false; 
            return ((StrokeIntersection)obj == this);
        } 

        /// 
        /// GetHashCode
        ///  
        /// 
        public override int GetHashCode() 
        { 
            return _hitSegment.GetHashCode() ^ _inSegment.GetHashCode();
        } 


        /// 
        /// operator == 
        /// 
        ///  
        ///  
        /// 
        public static bool operator ==(StrokeIntersection left, StrokeIntersection right) 
        {
            return (left._hitSegment == right._hitSegment && left._inSegment == right._inSegment);
        }
 
        /// 
        /// operator != 
        ///  
        /// 
        ///  
        /// 
        public static bool operator !=(StrokeIntersection left, StrokeIntersection right)
        {
            return !(left == right); 
        }
 
        #endregion 

        #region Internal API 

        /// 
        ///
        ///  
        internal static StrokeIntersection Full { get { return s_full; } }
 
        ///  
        ///
        ///  
        internal bool IsEmpty { get { return _hitSegment.IsEmpty; } }


        ///  
        ///
        ///  
        internal StrokeFIndices HitSegment 
        {
            get { return _hitSegment; } 
        }

        /// 
        /// 
        /// 
        internal StrokeFIndices InSegment 
        { 
            get { return _inSegment; }
        } 

        #endregion

        #region Internal static methods 

        ///  
        /// Get the "in-segments" of the intersections. 
        /// 
        internal static StrokeFIndices[] GetInSegments(StrokeIntersection[] intersections) 
        {
            System.Diagnostics.Debug.Assert(intersections != null);
            System.Diagnostics.Debug.Assert(intersections.Length > 0);
 
            List inFIndices = new List(intersections.Length);
            for (int j = 0; j < intersections.Length; j++) 
            { 
                System.Diagnostics.Debug.Assert(!intersections[j].IsEmpty);
                if (!intersections[j].InSegment.IsEmpty) 
                {
                    if (inFIndices.Count > 0 &&
                        inFIndices[inFIndices.Count - 1].EndFIndex >=
                        intersections[j].InSegment.BeginFIndex) 
                    {
                        //merge 
                        StrokeFIndices sfiPrevious = inFIndices[inFIndices.Count - 1]; 
                        sfiPrevious.EndFIndex = intersections[j].InSegment.EndFIndex;
                        inFIndices[inFIndices.Count - 1] = sfiPrevious; 
                    }
                    else
                    {
                        inFIndices.Add(intersections[j].InSegment); 
                    }
                } 
            } 
            return inFIndices.ToArray();
        } 

        /// 
        /// Get the "hit-segments"
        ///  
        internal static StrokeFIndices[] GetHitSegments(StrokeIntersection[] intersections)
        { 
            System.Diagnostics.Debug.Assert(intersections != null); 
            System.Diagnostics.Debug.Assert(intersections.Length > 0);
 
            List hitFIndices = new List(intersections.Length);
            for (int j = 0; j < intersections.Length; j++)
            {
                System.Diagnostics.Debug.Assert(!intersections[j].IsEmpty); 
                if (!intersections[j].HitSegment.IsEmpty)
                { 
                    if (hitFIndices.Count > 0 && 
                        hitFIndices[hitFIndices.Count - 1].EndFIndex >=
                        intersections[j].HitSegment.BeginFIndex) 
                    {
                        //merge
                        StrokeFIndices sfiPrevious = hitFIndices[hitFIndices.Count - 1];
                        sfiPrevious.EndFIndex = intersections[j].HitSegment.EndFIndex; 
                        hitFIndices[hitFIndices.Count - 1] = sfiPrevious;
                    } 
                    else 
                    {
                        hitFIndices.Add(intersections[j].HitSegment); 
                    }
                }
            }
            return hitFIndices.ToArray(); 
        }
 
        #endregion 

        #region  Fields 

        private StrokeFIndices _hitSegment;
        private StrokeFIndices _inSegment;
 
        #endregion
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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StrokeIntersection.cs source code in C# .NET

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